Perhaps you should try some spelling variations:
"synchronising swimming" » "synchronizing swimming", "synchronising stemming"
"synchronism swimming" » "synchronism stemming", "synchronized swimming"
"synchronisations swimming" » "synchronisations stemming", "synchronisation swimming", "synchronizations swimming", "synchronization swimming"
"synchronize swimming" » "synchronize stemming", "synchronized swimming", "synchronizing swimming"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("synchronising swimming") OR ("synchronism swimming"))) or ("synchronisations swimming"))) or ("synchronize swimming"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("synchronising swimming") OR ("synchronism swimming"))) OR ("synchronisations swimming"))) OR ("synchronize swimming")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"synchronising swimming\") OR (\"synchronism swimming\"))) or (\"synchronisations swimming\"))) or (\"synchronize swimming\"))".
• Removing quotes may allow a broader search: (((((( synchronising swimming ) OR ( synchronism swimming ))) or ( synchronisations swimming ))) or ( synchronize swimming )).
• Adding a wildcard symbol may retrieve word variants: (((((("synchronising swimming") OR ("synchronism swimming"))) or ("synchronisations swimming"))) or ("synchronize swimming"))*.